论文标题
手性跨界拓扑敏感性的非扰动风味破裂
Nonperturbative Flavor Breaking in Topological Susceptibility at Chiral Crossover
论文作者
论文摘要
我们证明，QCD拓扑敏感性非扰动地产生了由风味 - 非新兴夸克冷凝物在手性交叉的伪临界温度附近发出的显着贡献。它意味着在轴向异常中出现了显着的风味，以及高温QCD中的QCD theta真空吸尘器，在真空中几乎是普遍的风味。非平凡的风味破裂是由手性跨界周围的非扰动热环校正触发的，这与在渐近高温下观察到的夸克质量比刚刚缩放的琐碎风味不同。这种危害风味违规行为不能由晶格QCD通常比较的手性扰动理论决定，也不能基于其天体物理含义的稀释液体激气气近似。这将影响QCD轴的热史和宇宙学的演变，包括对遗物丰度作为暗物质候选者的估计。
We demonstrate that the QCD topological susceptibility nonperturbatively gets a significant contribution signaled by flavor-nonuniversal quark condensates at around the pseudo-critical temperature of the chiral crossover. It implies a remarkable flavor breaking in the axial anomaly as well as the QCD theta vacuum in high temperature QCD, which are almost flavor universal in the vacuum. A nontrivial flavor breaking is triggered by nonperturbative thermal loop corrections at around the chiral crossover, which is different from the trivial flavor violation just scaled by the quark mass ratio, observed at asymptotically high temperatures. This critical flavor violation cannot be dictated by the chiral perturbation theory with that lattice QCD usually compares, or the dilute instanton gas approximation based on that its astrophysical implications have conventionally been made. This would give an impact on the thermal history and the cosmological evolution of QCD axion including the estimate of the relic abundance as a dark matter candidate.
